Lea Knelsen
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Lea Knelsen gained media attention after it was revealed that she unknowingly traveled from Thailand to Canada carrying the measles virus, which contributed to an outbreak following a wedding in New Brunswick.
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Recent news mentions
In that Maritime town, on Oct. 18, 2024, Lea Knelsen attended her sister’s wedding, where she spread the virus to unvaccinated guests.
Canada is close to losing its measles elimination status. What happens then?The Globe and Mail·
Canada· 2025-10-09
Canada· 2025-10-09
Patient zero was Lea Knelsen, a Canadian living in Thailand, who travelled around the world to attend her sister’s wedding in rural New Brunswick.
How a single measles case became 5,000 – and the lessons not learnedThe Globe and Mail·Canada· 2025-09-23
Canada· 2025-09-23Also mentioned
Nathan Vanderklippe
Lea Knelsen traveled from Thailand to attend her sister's wedding and later tested positive for measles.
How the measles made its way back to Canada and threatened our victory over the virusThe Globe and Mail·Canada· 2025-09-20
Canada· 2025-09-20
Lea Knelsen was unaware she was sick with measles when she traveled to Canada for a wedding.
Behind my search for the source of the measles resurgenceThe Globe and Mail·Canada· 2025-09-20
Canada· 2025-09-20
